First of all, there are many things that can cause emails that you are expecting to go to the spam folder and sometimes it is on the end of the sender. If they haven't taken the precautions necessary to keep from getting into spam blacklists, then they will need to address that. The spam filters are sophisticated enough now that senders need to do a few things on their end to make sure that the recipient email servers know that they are legitimate. If you signed up for a newsletter of some sort, it's possible that the sender falls into that category.
However! Spam filters are not perfect and they can either flag the wrong email for spam if the algorithm thinks it looks "spammy" and they can also put spam in your inbox because the spam didn't hit enough triggers to be put in the junk folder. There are a couple of ways to handle that.
If you see email in your junk folder that should not be there. Select the email and then go up to the top of the screen and click the "Not Junk" icon. This will help the spam filter to learn what us junk and what isn't.
Contact Us for Help - We have a tool available for those of you that want to get into your spam filters and tweak the settings along with whitelists and blacklists. Let us know if you want to take a look at it!